How to ungroup windows on Unity task switcher?

I'm playing with ubuntu 12.04, precise pangolin, and there's an issue I can't see how to solve.

If I have three instances of, let's say, Firefox, in the switcher appears a single Firefox icon, I have to wait something like a second for it to open so that I can finally choose the one I'm looking for

I tried with compiz-settings and the unity plugin but couldn't find an option to ungroup Windows.

You can also press alt + ` (the key above Tab) to switch between instances of the current application.

Open Settings > Keyboard > Navigation > Switch Windows > Your_Key-Combo > Done! I am using Ubuntu 17.10. Its that simple

Press down arrow while holding alt+tab to view list of windows for current application.

To get all windows expanded from the beginning in a single list while switching with ALT-TAB I've gone to CompizConfig -> Windows Management -> Static Application Switcher (enabled this): Dialog popped up, I selected to solve the conflicts, in any of the question pop ups I've hit the most rightest button to deactivate the conflicting button. Thats all.

(To get back to Unity behaviour, goto CompizConfig -> Desktop -> Unity Plugin -> Switcher (tab) -> reset all settings with the x buttons at the right)

EDIT: You have to have the compiz-plugins package installed in order to access the Static Application Switcher plugin.